WorldEvent now has keycode, and Renderer has been slightly updated
World's static modifier has been removed and replaced with an instance reference held inside the Cortex_Client class.
World, World Listener, and World Event classes have been moved into their own sub package, and import statements have been added to the classes that access the world objects. Also modifiers have been changed to public to enable this accordingly.
Modified World class to include an ArrayList of WorldListener references, instead of a single reference.